无法使用 python 和 selenium 点击链接

Question

from selenium import webdriver
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By


# go to website
chrome_options = Options()
chrome_options.add_experimental_option("detach", True)
driver = webdriver.Chrome(executable_path="chromedriver.exe", chrome_options=chrome_options)
action = webdriver.ActionChains(driver)
driver.get('https://www.clinicalkey.com/#!/browse/book/3-s2.0-C2016100010X')

# look for "login" and click
loginclick = driver.find_element_by_xpath("//*[@id='header']/div[3]/ol/li[3]/a/span").click()

为什么我在导航到给定的网站后无法点击右上角的登录部分？我收到一个错误：

Exception has occurred: NoSuchElementException
Message: no such element: Unable to locate element: {"method":"xpath","selector":"//*[@id='header']/div[3]/ol/li[3]/a/span"}
  (Session info: chrome=85.0.4183.83)
  File "C:\python\download.py", line 18, in <module>
    loginclick = driver.find_element_by_xpath("//*[@id='header']/div[3]/ol/li[3]/a/span").click()

谢谢！

Answer 1

两个原因：

1：等待元素加载

2：由于元素在页面上不可见，请使用 java 脚本单击

driver.get('https://www.clinicalkey.com/#!/browse/book/3-s2.0-C2016100010X')
# look for "login" and click
loginclick=WebDriverWait(driver, 30).until(EC.presence_of_element_located((By.XPATH, "//*[@id='header']/div[3]/ol/li[3]/a/span")))
driver.execute_script("arguments[0].click();", loginclick)

输出：